| Babyland Holdings Limited | Financial services | 2021 |
| Babylon Bazaar Ltd | Wholesale & retail | 2022 |
| BAC2BAC Ltd | Wholesale & retail | 2018 |
| Bachmann Europe PLC | Manufacturing | 1989 |
| Back Lane Property Management Limited | Households | 2017 |
| Back Slap Media Limited | Professional & scientific | 2025 |
| Back to Black Limited | Manufacturing | 1990 |
| Back to Factory Limited | Wholesale & retail | 2021 |
| Back to School Ltd | Wholesale & retail | 2025 |
| Backgardens Limited | Administrative & support | 2013 |
| Backup Centre Ltd | Information & communication | 2021 |
| Backup Power Services Ltd | Manufacturing | 2025 |
| Backyard Trading Limited | Wholesale & retail | 2025 |
| Baddesley Stores Limited | Wholesale & retail | 2005 |
| Baddies Tanning Ltd | Other services | 2024 |
| Badger Compliance Limited | Professional & scientific | 2026 |
| Badgerbuilds Ltd | Information & communication | 2026 |
| Badiani Enterprise Ltd | Financial services | 2017 |
| Badirine Limited | Construction | 2025 |
| Badjie Autos Limited | Wholesale & retail | 2016 |
| Badr Management Limited | Professional & scientific | 2025 |
| Badu.Pl Ltd | Manufacturing | 2017 |
| Badyal Properties Ltd | Real estate | 2022 |
| Baek Sealants Limited | Construction | 2025 |
| Baenique Limited | Wholesale & retail | 2020 |
| Baesyc Ltd | Wholesale & retail | 2025 |
| Bafan Traders Ltd | Wholesale & retail | 2025 |
| Bagel Break Ltd | Hospitality | 2017 |
| Baggaley Property Maintenance Limited | Real estate | 2018 |
| Baggrave Farms Limited | Agriculture & fishing | 1990 |
| Baggrave Park Hungarton Limited | Administrative & support | 2000 |
| Bagh Co. Limited | Information & communication | 1998 |
| Bagk Holdings Limited | Real estate | 2023 |
| Bagri Housing Ltd | Real estate | 2025 |
| Bahadur Investment Group Ltd | Real estate | 2025 |
| Bahi Limited | Professional & scientific | 1998 |
| Bahia Corp Limited | Wholesale & retail | 2010 |
| Bahl Consulting Limited | Professional & scientific | 2021 |
| Bahlayresidentials Limited | Real estate | 2021 |
| Bahra Locumming Limited | Professional & scientific | 2022 |
| Bahria Prop Limited | Real estate | 2016 |
| BAI G Construction Ltd | Construction | 2025 |
| BAI G Transport Ltd | Transport & logistics | 2025 |
| BAI Properties Limited | Real estate | 2018 |
| Baibabs Ltd | Health & social care | 2022 |
| Bailey's Blitz Ltd | Administrative & support | 2018 |
| Baileybertschinger Ltd | Professional & scientific | 2021 |
| Baileys Professional Hairdressing Limited | Other services | 2009 |
| Bainbridge Compton Ltd | Wholesale & retail | 2024 |
| Bainbridge Haulage Ltd | Transport & logistics | 2014 |
| Baines Associates Limited | Professional & scientific | 2007 |
| Baines Mechanical Limited | Administrative & support | 2025 |
| Bains & Bains (Leicester) Limited | Real estate | 2015 |
| Bains & Bennett Enterprise Limited | Real estate | 2020 |
| Bains Accountants Limited | Professional & scientific | 2016 |
| Bains Aman Courier Ltd | Transport & logistics | 2020 |
| Bains and Associates Property Limited | Real estate | 2016 |
| Bains Asset Management Limited | Financial services | 2019 |
| Bains Investment Group Limited | Construction | 2025 |
| Bains Property & Developments Ltd | Real estate | 2022 |
| Bains Therapy Ltd | Health & social care | 2025 |
| Bains Transport Limited | Construction | 2003 |
| Bainsal Trading (UK) Ltd | Manufacturing | 2024 |
| Baio Properties Ltd | Real estate | 2024 |
| Bajrang B Limited | Real estate | 2025 |
| Bajrang Ltd | Wholesale & retail | 2024 |
| Bajrang Traders Limited | Wholesale & retail | 2026 |
| Bajuni Welfare Association | Other services | 2025 |
| Bajwa Healthcare Ltd | Health & social care | 2022 |
| Bajwa Homes Ltd | Real estate | 2018 |
| Bake House Coalville Management Company Limited | Real estate | 2012 |
| Baked Well Foods Ltd | Manufacturing | 2020 |
| Bakehouse Yard Studio Ltd | Construction | 2025 |
| Baker Fairchild Limited | Administrative & support | 2015 |
| Baker Jayne Insurance Brokers Ltd | Financial services | 2009 |
| Baker Reign Limited | Extraterritorial | 2014 |
| Baker Sports Ltd | Education | 2025 |
| Baker ST Cakes Ltd | Wholesale & retail | 2015 |
| Baker ST Holdings Ltd | Manufacturing | 2020 |
| Baker Street Consultancy Limited | Financial services | 2007 |
| Bakeress Box Ltd | Wholesale & retail | 2023 |
| Bakers Group Limited | Professional & scientific | 2010 |
| Bakers Investments Holdings Limited | Financial services | 2023 |
| Bakers Investments Limited | Real estate | 2023 |
| Bakers Ready MIX Concrete Ltd | Manufacturing | 2025 |
| Bakery Backup Limited | Manufacturing | 2023 |
| Bakery Close (Cosby) Apartments Management Company Limited | Hospitality | 2017 |
| Bakhder Medical Ltd | Health & social care | 2025 |
| Bakhsh Natt Transports Ltd | Transport & logistics | 2021 |
| Bakofys Limited | Information & communication | 2016 |
| Bakuyard CIC | Education | 2026 |
| BAL Construction (Leics) Ltd | Construction | 2024 |
| BAL Saab Ltd | Transport & logistics | 2024 |
| BAL Vision Limited | Health & social care | 2016 |
| Balaboom Ltd | Hospitality | 2026 |
| Balaji Nexus Ltd | Information & communication | 2025 |
| Balaji Restaurant and Sweets Ltd | Hospitality | 2025 |
| Balakrishnan Limited | Real estate | 2018 |
| Balarose Properties Limited | Real estate | 1988 |
| Balasundry Innovation Limited | Information & communication | 2024 |